平均误差

It is found that the fitting accuracy is higher and the mean relative error between fitted and standard value is less than 0.3%.

该方法的拟合精度较高，拟合值与辐射模式标准值的平均相对误差在0.3%以下。

Take the average operational length as the property evaluation target of processes control, the disturbance mode on the monitory control affected by two kinds of different typed measuring error was analyzed.

以平均运行长度作为过程控制性能评价的指标，分析了两种不同类型的测量误差对监控性能的干扰模式。

CONAB's December area estimate has averaged a 3 percent error predicting the final.

CONAB在12月份作出的预测与最终预测之间的误差平均为3％。

The relative Mean Error Percent between the forecast value of the 10 groups of testing samples and the observed value are all below 4%.

训练好的模型经10组检验样本检验，其预报结果和实测结果的平均相对误差都低于4%。

By means of PSO and taking the minimum mean absolute percentage error of the forecasting model as objective function, the optimal model parameters are chosen.

通过粒子群优化算法，以模型预测平均绝对百分误差最小为目标，选择最优的模型参数。

The instrument simultaneously sample for three phase voltage and current. Rotary photoelectric coding switch and LCD are used for human-computer interaction. it makes the interface compact and efficient. Utilizing the function of positive and negative edge trigger of the programmable counter array unit in MPU, signal zero-cross is captured for the phase detected based on double way. The software synchronism sampling method based on real-time parameter self-optimizing minishes period truncation error, and the measurement accuracy is improved. The digitization power measure imports traditional two-unit and three-unit methods and expands application range of the instrument. The capacity is discriminated by soft ware table-look-up on the load loss. The value of a quantity is converted to the value when reference temperature (75 ℃) from test temperature.

该仪器具有以下特点：仪器对三相电压电流同时采样；基于旋转式光电编码器和液晶显示屏的人机交互界面简洁而高效；可编程计数器阵列PCA"捕获"信号的过零点用于双向过零平均鉴相，得到准确的相位差和周期；基于实时参数自寻优的软件同步采样，有效地减小了周期截断误差，提高了测量准确度；数字化功率测量引入了传统的二表法和三表法，扩展了仪器的使用范围；实际容量根据负载损耗用软件查表的方法来判别；测量值已从试验温度折算到了参考温度(75℃)时的值。

According to the grinding force experience formula, The results which are affected by speed of grinding wheel, feed rate and working piece speed are received.

通过验证，所提出的公式的平均相对误差在2%以内，对生产实践具有一定借鉴和指导作用。

The calculating results of precipitable water by using our empirical expressions agree well with the actual ones.

仅利用地面水汽压计算出的整层大气可降水量和有效水汽含量，同实际情况符合得很好，平均相对误差普遍小于15％。

The spatial distribution pattern of the factors shows that distinct radiolarian assemblages are closely related to water mass, ocean current and hydrographic conditions.(4) The test of a new radiolarian-based transfer function to estimate mean-annual sea surface temperature and se

利用57个样品的统计数据，对估计表层海水年平均温度和其变化范围的放射虫转换函数（Pisias，1997）的检验结果表明，其估计误差为6℃，实际值与估计值的相关性差，可靠性低，不适合于本区使用。

The average and maximum relative errors of the approximation do not exceed 1.0% and 2.0% respectively, compared with theoretical results, which explains its accuracy.

对此，提出了一种简单而实用的近似式，该式与理论值的平均和最大相对误差分别不超过1.0%和2.0%，说明了该近似公式的准确性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。